Weighing-machine.



G. WALKER.

WEIGyHING MACHINE.

APPLIoATIoN FILED APR. 21, 191s.

20 indicated on the dial.

25 vised and which UNITED STATES PATENT ,.OFFIOE.' i,

GEORGE WALKER, OF NEW BRITAIN, CONN CLARK, F NEW BRITAIN, CONNECTICECTIOUT, AssrGNoR To LANDERS, maar @c 1 UT, A CORPORATION OFCONNECTICUT..

WEIGHING-MACHINE.

Specification of Letters Patent.

Application led April 21, 1913. Serial No. 762,487.

To all @com t may concern:

Bev 1t known that I, GEORGE WALKER, a

- citizen of the United States, and a resident' of New Britain, in thecounty of Hartford and State of Connecticut, have invented certaln newand useful Improvements in Weighing-Machines,.of which the following isa specification. i

This invention relates generally to weighing machines, but theparticular object of the invention has( been to produce a very small andcompact machine having great accuracy and largecapacity. `A machme ofthis character is especially well designed for use as a bath room scale,because of its size' and the' arrangement of the dial and pointer belowthe loadfreceiving platform so that a -person .standing upon theplatform and looking down is able to read Ithe weight The machine is ofcourse adapted for use in lthe weighing of all sorts of Objects andcommodities, and its especial novelty is to be found in the mechanismwhich I have depermits of an' extremely compact construction coupledwith accuracy of operation and large capacity.

An embodiment of the invention is shown in the drawings wherein- '30Figure l is a side view with a part of the casing removed.v Fig. 2 is acentral transverse sectional view.'

Describing the embodiment of the invention illustrated in the drawings,1 denotes 3'5 the baseland. 2 the low upstanding casing mounted thereonand preferably integral therewith. The base is recessed in. itslinderside and projects'to the front beyond the load-receiving platform,and under 4the base -is mountedI adial 3, the graduations of which moveunder a sight aperture-4 and a fixed pointer 5. Of course it isimmaterial whether this, or the reverse arrangement of stationary dialand movable pointer is used.

4.5 The platform 6 is mounted at the top of the load-receiving frame 7which' has a limited vertical movement within the casing imid"carriesanti-friction devices, such as -terof the rollers,

rollers 8, whichcontact with the'tracks 9 or 10 in the front and rearwalls of the casing 50 i stationary part, the other endsrof these leversbeing connected with the frame and in vertical alinement. The balancesprings 15, 16 are attached to the ends of a springbarQ 17, which iscentrally connected to the center of the load-receiving frame as at 18,'be- 65 tween the guide llevers 11, 12. A rectifying or tareadjustment38 is provided for one of the springs, l5.

The dial is mounted on a vertical shaft 19 which is'supported insuitable bearingsfin'70 the casing Kand. carries a pinion y2O.,

21 denotes a rackcarrier supported upon a fixed pivot. yThis carrier hastwodiverging arms, 22, 23, to one of which, 22, is secureda stem 24having a threaded end 25 75 on which the rack 26 is adjustably mounted.'The manner of.A this mounting is as follows z-A holder 27 is providedwithapertured lugs 28, 29, the aperture in the former i being largeenough to slide freely over the stem, and that'in the latter beingthreaded to engage the thread at the end of the stem the rack 26 beingattached to the 'lug 29. By rotating the holder the rack can be adjustedup anddown the stem to changer its leverage. In the other arm 23 thereis secured a light spring member 30, which enters an aperture in thefree end of the rack and yieldingly holds it in position. -This springcan be readily disengaged from the 90 rack incase it needs adjustment onthe stem 24. Thatjpart of the stem between the lugs 28, 29, on theholder is of reduced size 1n order that' it may'yield slightly when aload is abruptly placed on the latform to relieve the rack and pinionrom undue Patented Mar. ,23, 1915. i

rame is positioned and guided in its 5v5 resides in having all parts ofthe mechanism,

strain. The carrier has also a lever arm 31 which is connected by a link32 with a moving part of the mechanism, as the spring bar, andpreferably in alinement with the points of attachment of the upper andlower levers with'the frame.

Another feature of vconstruction which 'is of great importance in orderto secure the greatest 'accuracy for weighing small loads as well 'aslarge', and for indicating any change in the amount of ,the loadincluding the balance springs, spring bar, the frame, the guide levers,and the lever arm of the carrier connected on what may be termed thelongitudinal center vof the frame; in` other words the points ofconnection between the balance springs and the spring bar, the springbar and the frame, the frame and the guide levers, and the spring barand the lever arms of the carrier lie in the central plane of the frame.This prevents cramping between the various parts and insures extremeaccuracy. v

The top of the casing overhangs the mechanism and the frame is providedwith a stop 25 which engages the top in order that the machine-may behandled and lifted by the platform without seriously disturbing themechanism.A

From this descriptin it will be seen that the downward movement oftheframe due to the presence'of a load-on the platform is resisted lbythe balance springs acting Vthrough the spring bar, and that thisdownward motion is communicated lto the rack through the link and thelever arm of the carrier, and the rack meshing with the pinion actuatesthe dial.

between said dial and pointer, said movable' -part being positivelyactuated in opposite directions. y

2. In a weighing machine, a low upstanding casing, a vertically-movingload-receiving frame mounted therein, a platform on said frame, ahorizontally oscillating indicator arranged below said platform and eX-posed beyond the edge-thereof, and a conl.springs connected between saidframe and casing, rollers carried by said frame, and oppositely arrangedtracks on the front and rear of said casing and on which said rollersrun, the distance between the opposed tracks being slightly greater'than the diameter ofv the rollers.

4. A casing, a load-receiving frame therein, balance springs, aninterposed member forming a connection between said springs and frame,and movable relatively to the latter, guide levers connected with saidframe, pivotal supports for .said levers, indicating mechanism includinga movable member, and connections between said interposed member and themovable member of said.indicating -mechanism.

5. A casing, a load-receivinge frame 'mounted therein, balance springs,a spring bar, a pivotal connection'between said bar and frame andbetween the ends of said bar Land said springs, indicating mechanismincluding amovable' member, means for actuating said movable member, andconnections `The weighing machine here illustrated/'w between said meansand said spring bar.

and described represents the embodiment of anxunusually completemechanism in a compact space', having a delicate and extremely accurateaction yet of substantial capacity; and having a novel and veryconvenient colg location of platform and dial.

Change or modiation based upon the principle of construction andoperation here described may be made Iwithout departing from thescope ofthe invention asoutlined in the appended claims.

I claim 'as my invention:-

1. In a weighing machine, a recessed base', la low upstanding'casingthereon, weighing mechanism within said casing, including aload-receiving frame projecting through the top of said casing, aplatform on said frame,

ya recessed extension at one side of said base having a sight aperturein-i15s upper` wall beyond the edge 'of said platform', 'a dial Awithinthe recessed base and extension the graduations; of which register withsaid aperture, a pointer, and meansactuated by Said frame. for,producing'relative motion i means.

7. A casing, a frame mounted therein for vertical movement, guide leversrespectively connected at rectangular load-receiving one end to thetopand bottom of said frame, l

stationaryI pivots on which the opposite ends ofsaid levers are mounted,balance springs supported by said casing, a spring bar centrallysupported at the center of said frame and connected atits ends with saidsprings, indicating, mechanism, operating means therefor, andconnections between said bar and operating means in substantial aline-.ment ,with the points of connection 5 of the guide levers with theframe.

e. 1n aweighing machine, the combination with weighing mechanism andindicating mechanism including a movable member, of connections betweenthe former and the movable member of the latter comprising a pinion onsaid movable member, a pivotally mounted rack .carrier connected with'said weighing mechanism, and a rackadjustably mounted on said carrier.

9. In a weighing machine, the combination withI weighing mechanism andindicating mechanism including a movable member, of connections betweenthe former and the movable member of the latter comprising a pinion onsaid movable member, a'rack carrier connected with said weighingmechanism, araclradjustably mounted on said said holder, and a springmember mounted vided with aperturdd lugs lto receive said carrier, andholding means for said rack.

10. In a weighing machine, the combination with'weighing mechanism andindicating mechanism` including a movable member, of connections betweenthe former and' -the movablemember of thehlatte'r comprisprovided withapertured lugs to receive said stem, one pf said lugs having threadedengagement therewlth, and a rack secured to said holder.

-12. InaWeighing machine, the combina--^ tion with the weighingmechanism and indieating mechanism including a movable member, ofconnections between the former and. the movable member of the lattercompris ing a pinion on ,said movable member, a rack carrier connectedA'with said weighing mechanism, Y a stem on said carrier; a holder pro'-stem'; yone of said lugs having threaded engagement with said stem', arack secured to on the carrier and engaging the end of said tion withthe weighing mechanism and indi'- stem, one of .said lugs havingthreaded enmsm 13.,'In a weighing machine, the combinaeating mechanismincludinga movable member, lof connections betwee the former and themovable memberofl the latter, comprising a pinion on said movablemember,"a rack carrier connected with said weighing' mechanism, a stem`on said carrier, a holder pro-- vided with .aperturedl lugs to receivesaid and lower frame members,

`mechanism and operatmg means therefor lconnected to said mtermedlatemember 1n moving load -receiving frame,

gagement with said stem, a rack secured to said holder, the vpart 'ofthe stem between said lugs being reduced in size to permit a slightspring of the stem under 'abnormal conditions. f

. 14. In a weighing machine, the combination with the weighing mechanismand indieating mechanism including a'movable member, of connectionsbetween the former and movable member of the latter, comprising a tpinion on said movable member, and a rack carrier, said carrierbeingprovided with a lever arm connected` with said weighing mechanism and apair of diverging arms; a stem capable of slight yielding actionJ underabnormal conditions, secured to one arm, a rack adj ustably mounted onsaid stem, and

. a spring 'member secured to the other arm and detachably rack. 15. Ina weighing machine, a rectangular engaging the end of saidload-receiving frame, balance springs and, fixed supportsl therefor,guide levers connected to the transverse members of said frame at oneside of its center, and with their opposite. ends mounted on fixedpivots at the opposite side of the center, and a spring bar centrallyconnected with the frame between said leversand connected at *its endswith said balance springs.

16. In a weighing machine, a load-receiving frame, balance springs andixed sup- -ports therefor, a spring bar secured at lts center pivotallyto said frame and connected at its ends to said springs, guide levers,one

labove and one below said bar, fixed pivots on which an end of eachlever is mounted,

the other ends beingv connected^with said frame, indicating mechanismand operating means therefor connected to said bar.

' 17 In a weighing machine, a rectangular load-receiving frame includingupper vand lower frame members, balance springs and a fixed supporttherefor, an intermediate member connecting said springs and frame,guide levers providedat one end with-fixed pivotal 'supports andextending laterally to connect with the undersides of the upperindicating alinement with said lever and frame connections. 4

18.1511 a weighing machine, a verticallybalance springs,. a spring .barconnecting said springs and frame," guide levers for said frame, acarrier, and connections between said carrier and spring bar, the pointsof connectionibetween said parts lying in the plane of the longitudinalcenter of said frameyindicating mechanism and operative connectionsbetween said carrier and mecha'- 19. In a weighing machine, acasing, athe Sametime, balance-springs connected kpair of opposed tracks onopposite inner with the frame, and indicating mechanism 10 Walls neareach end of said casing, a loadactuated from the frame.

receiving frame vertically movable Within i said casing, anti-frictiondevices carried by GEORGE WALKER v said frame and arranged between themem- Witnesses:

bers of each pair of tracks and adapted to CHAS. D. INsIE,

contact withl but one track of each pair at JOSEPH F. LAMB.

